Magnetic Fluctuations and Turbulence in the Venusian Magnetosheath Downstream of Different Types of Bow Shock

Abstract

We statistically examine the characteristic scaling features of fluctuations in the dayside Venusian magnetosheath downstream of different types, quasi-parallel (Q_∥) and quasi-perpendicular (Q_⊥), of bow shock based on Venus Express data. We found that magnetic fluctuations have different characteristic scaling features downstream of Q_∥ and Q_⊥ bow shocks. Although the Venusian dayside magnetosheath is much thinner than the Earth magnetosheath, fully developed turbulence can be still observed downstream of the Q_∥ bow shock, while the turbulence is not dominant downstream of Q_⊥ bow shock. The type of bow shock plays an important role in the characteristic scaling features of downstream magnetic fluctuations. That means that the Q_∥ IMF might be a source of the turbulence in Venusian magnetosheath.